Boost may be the best idea yet, H22 runs best with the H22 trans, gearing is not ideal for the highway, I get tired of reaching for the shifter for the 6th gear that's not there. Boosted engines actually work better with the taller gearing of the Accord trans, and turbo setups can be found pretty cheap. Just remember someone has to tune the setup once it's installed, you might start by locating that person first to see what they like working with when it comes to the ECU setup.